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Friends groom together. Photo: Ronan Donovan

In our old age, humans tend to invest in fewer but more positive relationships. A new study of wild chimpanzees finds they seem to do the same.

The big picture: Prioritizing relationships as we age is thought to be tied to our unique awareness of our mortality, but the new findings suggest "social selectivity can emerge in the absence of complex future-oriented cognition," the authors write today in the journal Science.

What they did: Alexandra Rosati of the University of Michigan and colleagues used data from a two-decade-long study of wild chimpanzees in Uganda's Kibale National Park.

  • They looked at the interactions of 21 male chimpanzees — which socialize more often — ranging in age from 15 to 58 years old, and categorized them as "mutual friends," "one-sided friends" or "non friends."

What they found: The number of mutual friends a chimpanzee had increased with age while their one-sided friendships decreased.

  • By studying grooming habits, they report "chimpanzees invested more, and invested more equitably, in mutual relationships than one-sided ones, and older adults had more mutual friendships than younger adults did."
  • They also found the chimpanzees had fewer aggressive interactions as they got older.

How it works: Our perspective on our lives may drive our social behavior later in life, but the new findings suggest there may be other aging-related factors — for us and other species without the awareness of mortality.

  • In chimpanzees, their emotions become more stable as they age or they may be maximizing their chances to mate, even in old age, the NYT's James Gorman writes.
  • The findings "'should make us think twice' about the roots of some human behaviors," Ian Gilby, a behavioral ecologist at Arizona State University, Tempe, who was not involved in the study, told Science's Lucy Hicks.

Go deeper

Europe's energy reliance on Russia is a crucial shield for Putin

Photo: Pavel Bednyakov/Sputnik/AFP via Getty Images

Cracks in the NATO alliance regarding sanctions for Russia should President Vladimir Putin order troops into Ukraine are in large part based on energy supply concerns.

Why it matters: Russia holds tremendous leverage over some European countries because it provides roughly 40% of Europe's natural gas supply. In Germany, this figure is greater than 50%.

Why the Fed might want to jolt the markets

Fed chair Jerome Powell at a hearing earlier this month. Photo: Brendan Smialowski-Pool/Getty Images

So far, financial markets are cooperating nicely with the Federal Reserve's efforts to restrain inflation. They're doing the Fed's work for it by creating tighter financial conditions, in a distinctly non-panicky way.

  • But as the central bank's policymakers meet this week, an underlying question they face is whether the adjustment is happening too slowly.
Kate Marino, author of Markets
4 hours ago - Economy & Business

Omicron outbreaks were bad for business in January

Data: New York Federal Reserve Bank; Chart: Axios Visuals

Emerging anecdotal evidence shows just how hard the recent rise in COVID-19 cases hit businesses in early January — but that hasn't hurt some business leaders’ longer-term views of their companies' prospects.

Why it matters: Increasingly, the economic recovery has come in fits and starts that move in tandem with new peaks in cases. Look no further than the thousands of canceled flights and shuttered Broadway theaters in the wake of the Omicron variant's spread over the last few months.